ACH3218-681-TD01

Overview

The ACH3218-681-TD01 is a third-order LC(T-type) EMI filter circuit manufactured by TDK Corporation. Designed for power line applications, it features a capacitance of 68 pF and supports a rated current of 1.5 A at a voltage rating of 20 V. The component utilizes surface-mount technology in a 1207 (3225 metric) package with dimensions of 3.2 mm length and 1.8 mm height. It operates within a temperature range of -40°C to +125°C and provides attenuation in the frequency range of 95 MHz to 150 MHz.

Feature Summary

• Third-order LC(T-type) low-pass filter architecture designed for high-current circuits
• Surface-mount construction suitable for automated assembly processes
• Operational stability guaranteed across an extended industrial temperature range

Applications

• General-purpose EMI suppression in electronic equipment
• Power line filtering for low-voltage DC circuits
• Signal integrity protection in compact consumer electronics

Procurement Notes

Verify component authenticity through authorized TDK distributors or certified partners. Confirm RoHS compliance status and check for recent Product Change Notices regarding manufacturing updates. Ensure storage conditions meet moisture sensitivity level requirements prior to soldering. Validate that the specific suffix matches design specifications for impedance and capacitance values.

Selection Notes

Select this component when a third-order attenuation profile is required for single-channel power lines. Consider the 1.5 A current rating and 20 V voltage limit against circuit demands. Evaluate the 1207 footprint availability on the PCB layout. Compare cutoff characteristics against system noise frequencies to ensure effective suppression in the target bandwidth.

Part Context

This part belongs to the TDK ACH series of three-terminal EMI filters. These components integrate inductive and capacitive elements into a single SMD package to provide superior noise reduction compared to standard two-terminal capacitors. The series is engineered for applications requiring robust performance in space-constrained designs with significant current loads.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation. Consult TDK technical support for cross-reference recommendations if this discontinued or obsolete variant requires replacement.